Voivode George Martinuzzi, Sigismund I Ogier Ghiselin de Busbecq cuius regio, eius religio reservatum ecclesiasticum Declaratio Ferdinandei reservatum ecclesiasticum Declaratio Ferdinandei Menno Simons Huldrych Zwingli Valladolid Vienna Székesfehérvár^Lisa Jardine, ISBN 0-00-719257-6, Chapter 1; Richard Bruce Wernham,